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Share Capital and Share Premium (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Disclosure of classes of share capital [Line Items]      
Share premium $ 143,486   $ 140,334
Proceeds from issuance of share capital $ 0 $ 600  
February 2017 Private Placement      
Disclosure of classes of share capital [Line Items]      
Number of warrants exercised   37,500  
Proceeds from warrant exercises   $ 600  
Number of outstanding warrants   3,052,320  
Number of shares called by warrants   3,052,320  
October 2017 Private Placement      
Disclosure of classes of share capital [Line Items]      
Maximum proportion of owneship interest by a warrant holder after warrants exercises 4.99%    
Number of outstanding warrants 1,250,000 1,250,000  
Number of shares called by warrants 1,250,000 1,250,000  
October 2017 Private Placement | Maximum      
Disclosure of classes of share capital [Line Items]      
Maximum proportion of owneship interest by a warrant holder after warrants exercises 9.99%